using System;   

using System.Threading.Tasks;

public class Program

{

​

    public static async Task foo(string s)

    {

        try

        {

            var value = await Task.Run( () => Int32.Parse(s));

            Console.WriteLine("Yay "+ value);

        }

        catch(Exception)

        {

            Console.WriteLine("Buhu");

        }

    }

    public static void Main()

    {

        foo("222").Wait();

        Console.WriteLine("Hello World");

        foo("www").Wait();

    }

}